Download greasemonkey, then go to this page
( userscripts.org/scripts/show/103899 )
find the source code (there should be a bar at the top saying source code)
Copy, then open greasemonkey.
Go to source codes (or whatever it happens to say) and paste.
Open funnyjunk, go to your profile, go to ultimate fj toolbox settings, turn on green funnyjunk, and you're on your way!